Table 1 Basic characteristics of the subjects by hypertensive disorders of pregnancy (HDP) (n = 686)
|  | Total (n = 686) | HDP (n = 42) | Normotensive (n = 644) | #P values |
|---|---|---|---|---|
Mean (SD) or N (%) | ||||
Age (years) | 29.3 (3.8) | 30.6 (4.5) | 29.2 (3.8) | 0.02 |
Pre-pregnancy BMI (Kg/m2) | 21.3 (3.2) | 23.1 (3.8) | 21.2 (3.1) | < 0.001 |
Parity | ||||
 Nulliparous | 626 (91.5) | 39 (92.9) | 587 (91.4) | 0.4 |
 Parous | 58 (8.5) | 3 (7.1) | 55 (8.6) |  |
Education level | ||||
 Less than college | 95 (13.9) | 4 (9.5) | 91 (14.1) |  |
 aCollege degree | 529 (77.2) | 33 (78.6) | 496 (77.1) | 0.6 |
 Postgraduate degree | 61 (8.9) | 5 (11.9) | 56 (8.7) |  |